The second installment of the series looks at the Skyhook, a type of abridged Space Elevator that allows spacecraft to hook up and get into orbit at much lower launch speeds.

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https://www.youtube.com/watch?v=TlpFzn_Y-F0

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NASA HASTOL study on skyhooks in conjunction with Hypersonic aircraft:
http://www.niac.usra.edu/files/library/meetings/annual/jun01/391Grant.pdf